import { Injectable } from '@angular/core';

@Injectable({
  providedIn: 'root'
})
export class ToolsService {

  constructor() { }

  formatDate(time, fmt) {
    var date = new Date(time)

    if (/(y+)/.test(fmt)) {
      fmt = fmt.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length));
    }

    let o = {
      'M+': date.getMonth() + 1,
      'd+': date.getDate(),
      'h+': date.getHours(),
      'm+': date.getMinutes(),
      's+': date.getSeconds()
    };

    for (let k in o) {
      if (new RegExp(`(${k})`).test(fmt)) {
        let str = o[k] + '';
        fmt = fmt.replace(RegExp.$1, (RegExp.$1.length === 1) ? str : this.padLeftZero(str));
      }
    }
    return fmt;
  }

  padLeftZero(str) {
    return ('00' + str).substr(str.length);
  }

}
